[13.3] nutrient cycles (2/2) the phosphorus cycle Flashcards

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1
Q

what do we need phosphorous for?

A
  • phospholipids
  • ATP
  • nucleic acids
  • NAD
  • NADP
  • FAD
  • acetyl CoA
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2
Q

what form of phosphate do organisms usually use?

A

phosphate ion form

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3
Q

describe the phosphorus cycle

A
  • dissolved phosphate ions in oceans, lakes, and soils ➞ phosphate ions in plants via absorption
  • dissolved phosphate ions ➞ phosphates in rocks via sedimentation
  • phosphate ions in plants ➞ phosphate ions in animals via feeding and digestion
  • phosphate ions in animals ➞ phosphate ions in wastes and remains eg. guano, bones and shells via excretion and decomposition
  • phosphate ions in animals ➞ dissolved phosphate ions in oceans, lakes, and soils via excretion
  • phosphate ions in waste and remains ➞ dissolved phosphate ions in oceans, lakes, and soils via erosion
  • phosphate ions in wastes and remains ➞ phosphates in rocks via deposition
  • phosphates in rocks ➞ dissolved phosphate ions in oceans, lakes, and soils via erosion and use of fertilisers
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4
Q

describe the role of microorganisms in the phosphorus cycle (2)

A
  • function as decomposers / saprobionts
  • that break down the molecules in dead organisms to release phosphate ions into the ground
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5
Q

what problems can arise when fertilisers run in waterways?

A
  • eutrophication
  • algal blooms which lead to low-oxygen waters that can kill fish and reduce essential fish habitats
  • when the excessive algae decomposes, a large amount of carbon dioxide is produced, which lowers the pH of seawater
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